问题
填空题
求值:sin
|
答案
sin
+cos(-14π 3
)=sin(4π+25π 4
)+cos(6π+2π 3
)=sinπ 4
+cos2π 3
=π 4
.
+3 2 2
故答案为:
.
+3 2 2
求值:sin
|
sin
+cos(-14π 3
)=sin(4π+25π 4
)+cos(6π+2π 3
)=sinπ 4
+cos2π 3
=π 4
.
+3 2 2
故答案为:
.
+3 2 2